A Texas woman pleaded guilty today to mailing Ricin-laced letters to President Barack Obama and New York City Mayor Michael Bloomberg.

35-year-old Shannon Guess Richardson is behind bars after her appearance in federal court. The former actress played minor roles in “The Walking Dead” and “The Blind Side”.

Richardson was arrested in June for sending the poisoned letters. Because of the plea deal her sentencing is capped at 18 years. A sentencing date hasn’t been set.